Which of the following statements concerning sea urchin gastrulation is true?

0 votes

The archenteron forms at the animal pole, stretches to the vegetal pole, and eventually meets with the mouth.
The archenteron forms at the animal pole, stretches to the vegetal pole, and eventually meets with the anus.
The archenteron forms at the vegetal pole, stretches to the animal pole, and eventually meets with the mouth.
The archenteron forms at the vegetal pole, stretches to the animal pole, and eventually meets with the anus.